If nothing else, what do you expect Google to say? "No, we'll definitely be dropping this"?

The services that Google dropped were either big bets that ended up as massive failures in the marketplace (e.g. wave, google+) or services that were neither big nor strategic to google (e.g. google reader, google code).

GCP is neither.

If you're not convinced by the fact that Google has been pouring billions into Google Cloud for over 10 years now, organizes multi-day conferences promoting it, launches new features monthly, then no rational argument will convince you that they won't drop GCP because they also dropped google reader.